TSSetI2Function#

Set the function to compute F(t,U,U_t,U_tt) where F = 0 is the DAE to be solved.

Synopsis#

#include "petscts.h"  
PetscErrorCode TSSetI2Function(TS ts, Vec F, TSI2Function fun, void *ctx)

Logically Collective

Input Parameters#

  • ts - the TS context obtained from TSCreate()

  • F - vector to hold the residual (or NULL to have it created internally)

  • fun - the function evaluation routine

  • ctx - user-defined context for private data for the function evaluation routine (may be NULL)

Calling sequence of fun#

PetscErrorCode fun(TS ts, PetscReal t, Vec U, Vec U_t, Vec U_tt, Vec F,void *ctx);

  • ts - the TS context obtained from TSCreate()

  • t - time at step/stage being solved

  • U - state vector

  • U_t - time derivative of state vector

  • U_tt - second time derivative of state vector

  • F - function vector

  • ctx - [optional] user-defined context for matrix evaluation routine (may be NULL)

See Also#

TS: Scalable ODE and DAE Solvers, TS, TSSetI2Jacobian(), TSSetIFunction(), TSCreate(), TSSetRHSFunction()

Level#

beginner

Location#

src/ts/interface/ts.c

Examples#

src/ts/tutorials/ex43.c
src/ts/tutorials/ex44.c

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